NEON speedup: 2.31x
Auto-vect speedup: 2.26x

Test kernel: [-0.9432, -1.1528, 0, 1.1528, 0.9432]

NEON speedup: 2.36x
Auto-vect speedup: 2.36x

Test kernel: [0.1, 0.2408, 0.3184, 0.2408, 0.1]

NEON speedup: 9.46x
Auto-vect speedup: 1x

Test kernel: [-0.9432, -1.1528, 0, 1.1528, 0.9432]

NEON speedup: 8.64x
Auto-vect speedup: 1x

Test kernel: [0.1, 0.2408, 0.3184, 0.2408, 0.1]

NEON speedup: 2.12x
Auto-vect speedup: 1.01x

Test kernel: [-2, 0, 2]

NEON speedup: 3.27x
Auto-vect speedup: 1.01x

NEON speedup: 1.75x
Auto-vect speedup: 1x

NEON speedup: 2.04x
Auto-vect speedup: 1x

NEON speedup: 2.75x
Auto-vect speedup: 1.01x

NEON speedup: 2.66x
Auto-vect speedup: 1x

NEON speedup: 2.95x
Auto-vect speedup: 1x

Test kernel: [-0.9432, -1.1528, 0, 1.1528, 0.9432]

NEON speedup: 1.96x
Auto-vect speedup: 1x

Test kernel: [0.0708, 0.2445, 0.3694, 0.2445, 0.0708]

NEON speedup: 3.14x
Auto-vect speedup: 1.6x

Test kernel: [-5, -2, 0, 2, 5]

NEON speedup: 1.95x
Auto-vect speedup: 1.17x

Test kernel: [-2, 0, 2]

NEON speedup: 1.84x
Auto-vect speedup: 1.2x

NEON speedup: 3.86x
Auto-vect speedup: 1.67x

Test kernel: [0.0708, 0.2445, 0.3694, 0.2445, 0.0708]

NEON speedup: 2.56x
Auto-vect speedup: 1.26x

Test kernel: [1, 3, 1]

NEON speedup: 4.1
Auto-vect speedup: 2.25

Specifically, in general antisymmetric case src[-1] (S0) should be
subtracted from from src[1] (S2), and not the opposite.

In the unoptimized version of small symmetrical column filters, when we
try to detect if the kernel, ky, is equal to [1;2;1] or [1;-2;1] we
should take into consideration that the anchor points in the middle
element.

IPP can be switched on and off on runtime;

Optional implementation collector was added (switched off by default in CMake). Gathers data of implementation used in functions and report this info through performance TS;

TS modifications for implementations control;

1. someMatrix.data -> someMatrix.prt()
2. someMatrix.data + someMatrix.step * lineIndex -> someMatrix.ptr( lineIndex )
3. (SomeType*) someMatrix.data -> someMatrix.ptr<SomeType>()
4. someMatrix.data -> !someMatrix.empty() ( or !someMatrix.data -> someMatrix.empty() ) in logical expressions